Secondary Growth - Botany - Lecture Slides, Slides for Botany and Agronomy. Dhirubhai Ambani Institute of Information and Communication Technology
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suneeta9 January 2013

Secondary Growth - Botany - Lecture Slides, Slides for Botany and Agronomy. Dhirubhai Ambani Institute of Information and Communication Technology

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These are the important key slides of Botany are:Secondary Growth, Woody Plants, Secondary Growth and Lateral Meristems, Vascular Cambium, Woody Plants, Dicot Stems, Springwood, Softwoods Vs Hardwoods, Taxonomic Identity...
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Secondary growth

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Woody plants • 20% of all dicot species (oaks, maples) • 5% of all monocot species • All gymnosperms (pines, firs, redwoods)

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Secondary growth & lateral meristems

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Vascular cambium produces secondary vascular tissue in woody stems and

roots

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Woody roots

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vascular cambium

Woody plants & secondary growth

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Secondary growth of dicot stems

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springwood

summerwood Docsity.com

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Softwoods vs. hardwoods • Softwoods – no vessels, few fibers

– Pine, spruce

• Hardwoods – many vessels, fibers – Oak, maple

Resin canals

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Ring-porous wood vs. diffuse porous wood

• Used in taxonomic identity of woody species

Ash Beech

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Xylem Rays

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Ray cells conduct laterally

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Woody stem, l.s.

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heartwood sapwood

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Heartwood – xylem vessels blocked by tyloses

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Secondary phloem

phloem

fibers

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